Antenna



FIG. 1 is a front elevational view of an antenna showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a front, left, and bottom perspective view thereof.

The evenly broken lines in the drawings illustrate portions of the antenna that form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 